Officially modify the Periodic Table to include antimatter and hypothetical substances.

The current Periodic Table is flawed in one major way. It only lists confirmed substances comprising of normal matter atoms. Substances like antimatter and dark matter are excluded and have never been added. These substances, along with hypothetical substances like Neutronium, (link here: https://en.wikipedia.org/wiki/Neutronium#Neutronium_and_the_periodic_table
are ignored. This causes people who don't know about these substances to not even know they exist, which can lead to a loss in researchers interested in finding out more about these substances. I propose that a modified Extended Periodic Table be created and made official. (Note: This modification wouldn't just go up in atomic number, but into antimatter and may have a separate box for dark matter)